Source code for qcodes.instrument_drivers.ithaco.Ithaco_1211

from typing import TYPE_CHECKING

from qcodes.instrument import Instrument, InstrumentBaseKWArgs
from qcodes.parameters import MultiParameter, Parameter, ParamRawDataType
from qcodes.validators import Bool, Enum

    from typing_extensions import Unpack

class CurrentParameter(MultiParameter):
    Voltage measurement via an Ithaco preamp and converting volt to current.

    To be used when you feed a current into the Ithaco, send the Ithaco's
    output voltage to a lockin or other voltage amplifier, and you have
    the voltage reading from that amplifier as a qcodes parameter.

    ``CurrentParameter.get()`` returns ``(volt_raw, curr)``

        measured_param: a gettable parameter returning the
            voltage read from the Ithaco output.

        c_amp_ins: an Ithaco instance where you manually
            maintain the present settings of the real Ithaco amp.

            Note: it should be possible to use other current preamps, if they
            define parameters ``sens`` (sensitivity, in A/V), ``sens_factor``
            (an additional gain) and ``invert`` (bool, output is inverted)

        name: the name of the current output. Default 'curr'.
            Also used as the name of the whole parameter.
    def __init__(self,
                 measured_param: Parameter,
                 c_amp_ins: "Ithaco_1211",
                 name: str = 'curr'):
        p_name =

                         names=(p_name+'_raw', name),
                         shapes=((), ()),
                         setpoints=((), ()),

        self._measured_param = measured_param

        p_label = getattr(measured_param, "label", "")
        p_unit = getattr(measured_param, "unit", "")

        self.labels = (p_label, 'Current')
        self.units = (p_unit, 'A')

    def get_raw(self) -> tuple[ParamRawDataType, ...]:
        assert isinstance(self.instrument, Ithaco_1211)
        volt = self._measured_param.get()
        current = (self.instrument.sens.get() *
                   self.instrument.sens_factor.get()) * volt

        if self.instrument.invert.get():
            current *= -1

        value = (volt, current)
        return value

[docs] class Ithaco1211(Instrument): """ QCoDeS driver for the Ithaco 1211 Current-preamplifier. This is a virtual driver only and will not talk to your instrument. """ def __init__(self, name: str, **kwargs: "Unpack[InstrumentBaseKWArgs]"): super().__init__(name, **kwargs) self.sens: Parameter = self.add_parameter( "sens", initial_value=1e-8, label="Sensitivity", unit="A/V", get_cmd=None, set_cmd=None, vals=Enum(1e-11, 1e-10, 1e-09, 1e-08, 1e-07, 1e-06, 1e-05, 1e-4, 1e-3), ) """Parameter sens""" self.invert: Parameter = self.add_parameter( "invert", initial_value=True, label="Inverted output", get_cmd=None, set_cmd=None, vals=Bool(), ) """Parameter invert""" self.sens_factor: Parameter = self.add_parameter( "sens_factor", initial_value=1, label="Sensitivity factor", unit=None, get_cmd=None, set_cmd=None, vals=Enum(0.1, 1, 10), ) """Parameter sens_factor""" self.suppression: Parameter = self.add_parameter( "suppression", initial_value=1e-7, label="Suppression", unit="A", get_cmd=None, set_cmd=None, vals=Enum(1e-10, 1e-09, 1e-08, 1e-07, 1e-06, 1e-05, 1e-4, 1e-3), ) """Parameter suppression""" self.risetime: Parameter = self.add_parameter( "risetime", initial_value=0.3, label="Rise Time", unit="msec", get_cmd=None, set_cmd=None, vals=Enum(0.01, 0.03, 0.1, 0.3, 1, 3, 10, 30, 100, 300, 1000), ) """Parameter risetime"""
[docs] def get_idn(self) -> dict[str, str | None]: vendor = 'Ithaco (DL Instruments)' model = '1211' serial = None firmware = None return {'vendor': vendor, 'model': model, 'serial': serial, 'firmware': firmware}
class Ithaco_1211(Ithaco1211): """ Old alias for Itaco1211. Will eventually be deprecated and removed. """